In Saints as Divine Evidence, Robert MacSwain explores 'the hagiological argument' for God, that is, human holiness as evidence for divinity. Providing an overview of the contested place of evidence in religious belief, and a case study of someone whose short but compelling life allegedly bore witness to the reality of God, MacSwain then surveys sainthood as understood in philosophy of religion, ethics, Christian theology, church history, comparative religion, and cultural studies. With epistemological and hagiological frameworks established, he further identifies and analyses three distinct forms of the argument, which he calls the 'propositional', the 'perceptual', and the 'performative'. Each version understands both evidence and sainthood differently, and the relevant concepts include exemplarity, inference, altruism, perception, religious experience, performativity, narrative, witness, and embodiment. MacSwain's study expands the standard list of theistic arguments and moves the discussion from purely logical and empirical considerations to include spiritual, ethical, and personal issues as well.